since you pay tax in the uk and work for a uk subsidery you are under legal contract by uk -european law. when you work on an australian registered aircraft (as soon as the front door closes) you are under australian civil aviation regulation and its relevant laws. cap 370 is applicable as you are under uk contract. amicus should to be more informed (and i am sure they have legal reps) to counter such claims. its not time for a current affair its time you get some reps who know what they are doing